Forehead support for mask



FIG. 1 is a perspective view of a forehead support for a mask according to an embodiment of the design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line disclosure is intended to depict environmental structure and forms no part of the claimed design. 

The ornamental design for a forehead support for a mask, as shown and described. 